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Fair Value - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | $ 3,574 | $ 5,983
MSRs | 7,300 | 6,800
Other loans, net | 5,247,021 | 5,161,919
Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 3,574 | 5,983
Other loans, net | 5,247,021 | 5,161,919
Nonrecurring basis |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 3,574 | 5,983
MSRs | 7,316 | 6,769
Other loans, net | 6,520 | 6,897
Nonrecurring basis | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
MSRs | 7,316 | 6,769
Other loans, net | 0 | 0
Nonrecurring basis | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 3,574 | 5,983
Other loans, net | 6,520 | 6,897
Nonrecurring basis | Commercial real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 2,735 | 3,057
Other loans, net | 2,295 | 2,644
Nonrecurring basis | Commercial real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Commercial real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Commercial real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 2,735 | 3,057
Other loans, net | 2,295 | 2,644
Nonrecurring basis | Construction real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 3,204 | 3,322
Nonrecurring basis | Construction real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Construction real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Construction real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 3,204 | 3,322
Nonrecurring basis | Commercial |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 127 | 541
Nonrecurring basis | Commercial | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 127 | 541
Nonrecurring basis | Residential real estate |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 712 | 2,385
Other loans, net | 1,021 | 931
Nonrecurring basis | Residential real estate | Level 1 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Residential real estate | Level 2 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Other loans, net | 0 | 0
Nonrecurring basis | Residential real estate | Level 3 |  |
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Impaired loans carried at fair value | 712 | 2,385
Other loans, net | $ 1,021 | $ 931

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- Definition Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items] + References No definition available. + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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